Added implementation to keep the dates correct

Added events to the date time pickers so that the end date is always
after the start date
Set date time pickers in recurring expense form

The starting date and end date can not cross over in the opposite
direction, because they are data bound to each other
Added data bindings in Graph chart

Added the data bindings  used in the recurring expense chart to get the
same effect in the graph chart -the end date wont be earlier than the
start date
Added comments and some renaming

Renamed the multi input form. Added comments to the code of the
recurring expense form
Fixed spelling

Expense was spelled with a c instead of  an s in numerous places
Fixed up recurring expense form

Moved the radio buttons into the appropriate container. Reset the tab
index to something normal.
Added Recurring Income form

Added the form that enables entry of recurring incomes
Removed unused usings from RecurringInput
Added recurring income form to main form

The recurring income form can now be opened from the main form
Small fixes
Removed Unit testing project
Merge pull request #7 from Slowking770/Development

Recurring data entry